Abstract
The article uses the signal-to-noise ratio (SNR) method to identify the precursor strong signal of the atmospheric circulation in the early stage of the abnormal flood in the Xi River. And by using the equation derived from the Cross theory, the extreme frequency, duration and interval time of the flood water level of each stage of the Xi River are calculated. This study will help improve the accuracy of mid-and long-term prediction of abnormal floods in the Xi River Basin and provide a basis for government departments to make better water resources planning and flood prevention.
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